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In-stack particle size and composition transformations during circulating fluidized bed combustion of willow and forest residue |
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| Authors: | W Maenhaut M -T Fernndez-Jimnez T Lind E I Kauppinen T Valmari G Sfiris K Nilsson |
| Affiliation: | a Institute for Nuclear Sciences, Universiteit Gent, Proeftuinstraat 86, B-9000, Gent, Belgium b VTT Chemical Technology, Aerosol Technology Group, P.O. Box 1401, FIN-02044, VTT, Finland c VTT Energy, Aerosol Technology Group, Espoo, Finland d Vattenfall Utveckling AB, Stockholm, Sweden |
| Abstract: | The in-stack transformations of the particle size and composition of the fly ash were studied experimentally during combustion of forest residue and willow in a 35 MW circulating fluidized bed co-generation plant. Samples of the in-stack fly ash were taken with 11-stage Berner low pressure impactors (BLPIs) at two locations in the flue gas stream, i.e., downstream of the circulating cyclone at a temperature of 810–850°C and downstream of the convective back pass at a temperature of 150–160°C. The mass size distribution of the fly ash was derived from weighing the BLPI substrate films. For obtaining the multielemental composition of the fly ash as a function of particle size, the BLPI films were analyzed by both particle-induced X-ray emission (PIXE) and instrumental neutron activation analysis (INAA). |
| Keywords: | PIXE Multielement analysis Particle size Cascade impactor Biomass combustion |
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